Was browsing the web-site of what was formerly Lowry Digital.
It has been acquired by several companies over the years.
Anyways…RelianceMediaWorks is the company that owns Lowry now.
They claim they have done a 4K restoration on the Star wars trilogy.
Then click on Restoration.
Mod Edit: Unfortunately, the RMWUSA site is no more - though it can still be viewed here, via the Internet Archive’s WayBack Machine:-
http://web.archive.org/web/20140716150418/http://www.rmwusa.com/#work and then click on the ‘Restoration’ link.
(^ some patience is required for the page to fully load ^)
A screenshot image from the above page (featuring some of the restoration work they had performed):-
A screenshot image of when the Star Wars image was clicked on:-
(stating ‘Star Wars Trilogy : Lucasfilm, 4K 16-bit restoration’)
A two-minute ‘RMW Image Processing Demo Reel’ video by RWM, featuring Star Wars (amongst other movies RMW worked on), can be found here - at the Reliance Media Works’ vimeo page:-